AU2014270792B2 - Axial piston pump having a swash-plate type construction - Google Patents

Axial piston pump having a swash-plate type construction Download PDF

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Publication number
AU2014270792B2
AU2014270792B2 AU2014270792A AU2014270792A AU2014270792B2 AU 2014270792 B2 AU2014270792 B2 AU 2014270792B2 AU 2014270792 A AU2014270792 A AU 2014270792A AU 2014270792 A AU2014270792 A AU 2014270792A AU 2014270792 B2 AU2014270792 B2 AU 2014270792B2
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Australia
Prior art keywords
piston
adjustment
pump
swash plate
ball
Prior art date
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AU2014270792A
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AU2014270792A1 (en
Inventor
Ralf Bosch
Manuel KRONPASS
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Hydac Drive Center GmbH
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Hydac Drive Center GmbH
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Publication date
Priority to DE102013008677.9 priority Critical
Priority to DE102013008678.7 priority
Priority to DE102013008676.0 priority
Priority to DE102013008679.5A priority patent/DE102013008679A1/en
Priority to DE102013008681.7 priority
Priority to DE102013008629.9A priority patent/DE102013008629A1/en
Priority to DE102013008629.9 priority
Priority to DE102013008677.9A priority patent/DE102013008677A1/en
Priority to DE102013008678.7A priority patent/DE102013008678A1/en
Priority to DE102013008676.0A priority patent/DE102013008676A1/en
Priority to DE102013008681.7A priority patent/DE102013008681A1/en
Priority to DE102013008679.5 priority
Priority to PCT/EP2014/000658 priority patent/WO2014187512A1/en
Application filed by Hydac Drive Center GmbH filed Critical Hydac Drive Center GmbH
Publication of AU2014270792A1 publication Critical patent/AU2014270792A1/en
Application granted granted Critical
Publication of AU2014270792B2 publication Critical patent/AU2014270792B2/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26Control
    • F04B1/30Control of machines or pumps with rotary cylinder blocks
    • F04B1/32Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
    • F04B1/328Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the axis of the cylinder barrel relative to the swash plate
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00Coating starting from inorganic powder
    • C23C24/08Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C23C24/103Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
    • C23C24/106Coating with metal alloys or metal elements only
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01BMACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/10Control of working-fluid admission or discharge peculiar thereto
    • F01B3/103Control of working-fluid admission or discharge peculiar thereto for machines with rotary cylinder block
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01BMACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/10Control of working-fluid admission or discharge peculiar thereto
    • F01B3/103Control of working-fluid admission or discharge peculiar thereto for machines with rotary cylinder block
    • F01B3/106Control of working-fluid admission or discharge peculiar thereto for machines with rotary cylinder block by changing the inclination of the swash plate
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03CPOSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00Reciprocating-piston liquid engines
    • F03C1/02Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0602Component parts, details
    • F03C1/0605Adaptations of pistons
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/122Details or component parts, e.g. valves, sealings or lubrication means
    • F04B1/124Pistons
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/122Details or component parts, e.g. valves, sealings or lubrication means
    • F04B1/124Pistons
    • F04B1/126Piston shoe retaining means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014Details or component parts
    • F04B1/2035Cylinder barrels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014Details or component parts
    • F04B1/2064Housings
    • F04B1/2071Bearings for cylinder barrels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014Details or component parts
    • F04B1/2078Swash plates
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014Details or component parts
    • F04B1/2078Swash plates
    • F04B1/2085Bearings for swash plates or driving axles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26Control
    • F04B1/30Control of machines or pumps with rotary cylinder blocks
    • F04B1/303Control of machines or pumps with rotary cylinder blocks by turning the valve plate
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26Control
    • F04B1/30Control of machines or pumps with rotary cylinder blocks
    • F04B1/32Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26Control
    • F04B1/30Control of machines or pumps with rotary cylinder blocks
    • F04B1/32Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
    • F04B1/324Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0091Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using a special shape of fluid pass, e.g. throttles, ducts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08Regulating by delivery pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14Pistons, piston-rods or piston-rod connections
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02Parts of sliding-contact bearings
    • F16C33/04Brasses; Bushes; Linings
    • F16C33/06Sliding surface mainly made of metal
    • F16C33/14Special methods of manufacture; Running-in
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01BMACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/0082Details
    • F01B3/0085Pistons
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B19/00Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
    • F04B19/20Other positive-displacement pumps
    • F04B19/22Other positive-displacement pumps of reciprocating-piston type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/0873Component parts, e.g. sealings; Manufacturing or assembly thereof
    • F04B27/0878Pistons
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00Metallic materials; Alloys
    • F16C2204/30Alloys based on one of tin, lead, antimony, bismuth, indium, e.g. materials for providing sliding surfaces
    • F16C2204/34Alloys based on tin
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2223/00Surface treatments; Hardening; Coating
    • F16C2223/30Coating surfaces
    • F16C2223/46Coating surfaces by welding, e.g. by using a laser to build a layer
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00Engines or pumps

Abstract

The invention relates to an axial piston pump having a swash-plate type construction, in particular for hydraulic systems, comprising a cylinder drum (3) which can be rotationally driven about a rotational axis (7) in a pump housing (1) and in which pistons (9) are arranged in an axially displaceable manner, supporting by means of the actuation end thereof (11) which is accessible from the outside of the cylinder drum (3), at least indirectly a swash plate (15), said swash plate can be pivoted by means of an adjusting device (21) to the desired angles of inclination with respect to the rotational axis (7) for adjusting the stroke of the piston (9) and also the fluid system pressure generated thereby. Said adjusting device comprises an adjusting piston (35) in a hydraulically actuated adjusting cylinder (31), the movement thereof can be transmitted to the swash plate (15) by means of at least one driven connection comprising a pivot joint (37, 39; 29, 43), characterised in that the pivot joint is formed by a ball joint (37, 39) which is arranged between the piston (35) and the piston rod (41) of the adjusting cylinder (31).

Description

Axial Piston Pump Having a Swash-Plate Type Construction 2014270792 04 Aug 2017
The invention relates to an axial piston pump having a swash plate type construction, in particular for hydraulic systems, having a cylinder drum that can be driven about a rotational axis, in which pistons are disposed such that they can be displaced axially, which support, at least indirectly, a swash plate with their actuation ends that can be accessed from outside the cylinder drum, which swash plate can be pivoted by means of an adjusting device in order to adjust the stroke of the piston, and thus the fluid system pressure generated therewith, to a desired angle of inclination in relation to the rotational axis, which has an adjustment piston in an adjustment cylinder that can be actuated hydraulically, the movement of which can be transferred to the swash plate via at least one driven connection having a joint.
Axial piston pumps with a swash plate construction are the prior art. They are used widely for supplying pressure to loads such as power cylinders, hydraulic motors and suchlike. Axial piston pumps of the type specified in the introduction, in which the angles of the swash plates in relation to the rotational axis can be adjusted, are distinguished, with respect to likewise known axial piston pumps having stationary swash plates, by a better energy balance during operation. While pumps having stationary swash plates, which function as a fixed displacement pump with a predefined drive rotational rate, always convey a constant volume flow of the fluid, even when no energy is demanded from systems that are actuated by pressure means, and thus must overcome the flow resistances in the hydraulic circuit while running idle, for which drive energy is expended while supplying no useful energy, the pump delivery volume can be set to zero through the adjustability of the swash plate inclination, and the need for drive energy can be minimized. An axial piston pump of the type specified in the introduction is disclosed in DE 44 15 510 Cl.
The production costs for the known axial piston pumps of this type are high, because there is a significant engineering effort for the adjustment device having the driven connection, which converts the linear movement of the piston in the stationary adjusting cylinder into an arc- shaped movement of the swash plate. 1
Any discussion of documents, acts, materials, devices, articles or the like which has been included in the present specification is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the present disclosure as it existed before the priority date of each of the appended claims. 2014270792 04 Aug 2017
Throughout this specification the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.
According to the present disclosure, there is provided an axial piston pump of a swash plate construction, comprising: a cylinder drum rotatably driveable about a rotational axis in a pump housing; pump pistons disposed in said cylinder drum and axially displaceable in said cylindrical drum; a swash plate at least indirectly supported by said pump pistons at actuation ends of said pump pistons accessible outside of said cylindrical drum, said swash plate being pivotable to desired angles of inclination relative to said rotational axis; and an adjustment device adjusting the angles of inclination of said swash plate relative to said rotational axis and thereby adjusting lengths of strokes of said pump pistons to vary fluid pressure generated by said pump pistons, said adjustment device including a first adjustment piston and a second adjustment piston hydraulically operable and movable in first and second adjustment cylinders, respectively, said second adjustment cylinder being arranged counter and coaxial to said first adjustment cylinder, said second adjustment piston being movable counter to movement of said first adjustment piston, movement of said first adjustment piston in said first adjustment cylinder being transferable to said swash plate via a driven component having first and second joints, said first joint being a first ball joint located between said first adjustment piston and a first piston rod of said first adjustment cylinder, said second joint being between said first piston rod and an actuating part of said swash plate and being a second ball joint, said second adjustment piston being connected to a second piston rod at an end of said second piston rod by a third ball joint, said first and second piston rods being connected to said actuating part via said second ball 2 joint at ends of said first and second piston rods remote from the respective adjustment pistons, said actuating element being a pivot lever connected to said swash plate, said pivot lever having a free end, said second ball joint having a ball head on said free end of said pivot lever and facing dome-shaped surfaces on adjacent ends of said first and second piston rods forming a ball socket receiving said ball head. 2014270792 04 Aug 2017
According to the present disclosure, a joint for the driven connection between the swash plate and the adjustment cylinder is formed by a ball joint located between the piston and the piston rod of the adjustment cylinder. In contrast to a joint connection defining a joint axis, the piston is free of constraining forces, due to the design of the joint in the form of a ball joint.
This leads to less stress on the components, less piston friction with correspondingly less wear, and to a corresponding improvement of the operational reliability.
According to an embodiment disclosed herein, a second joint of the driven connection is formed between the piston rod and an actuating part of the swash plate by a second ball joint, by means of which corresponding advantages are obtained at the coupling point allocated to the swash plate.
The driven connection formed by the ball joints can be designed such that it exhibits no play whatsoever, in that a spring assembly is provided, that retains a ball head and a ball socket of the ball joint in position, in a force-locking manner.
To this end, the assembly can advantageously be formed such that the spring assembly simultaneously pre-loads the swash plate in the pivotal position corresponding to the maximum pump delivery rate. As a result of this double function of the spring assembly, the adjustment cylinder does not need to be configured as a double-action cylinder for generating adjustment movements in both directions, but rather, a single-action adjustment cylinder may be provided, which merely causes an adjustment movement from the pivoted position for maximum pump delivery rate to lower delivery volumes, up to and including zero capacity. 3
In an embodiment disclosed herein, a second adjustment cylinder is provided, counter to the first adjustment cylinder and sharing the same cylinder axis, perpendicular to the rotational axis, wherein the adjustment piston of the second adjustment cylinder can be moved hydraulically, counter to the movement of the adjustment piston of the first adjustment cylinder, and the piston rod of the second adjustment cylinder is connected at one end to the associated adjustment piston via a third ball joint, and at the other end, together with the piston rod of the first adjustment cylinder, forms the second ball joint at the actuating part of the swash plate. 2014270792 04 Aug 2017
In an advantageous manner, the actuating part can be formed by a pivot lever connected to the swash plate, which extends, laterally to the swash plate and the cylinder drum, parallel to the rotational axis when set to zero pump capacity, and the second ball joint is located at its free end. With this arrangement, the cylinder axis of the adjustment cylinder can be oriented transverse to the rotational axis, in order to move the pivot lever, and thus the swash plate, about a pivot axis via the ball joint located on the end of the pivot lever, which pivot axis runs perpendicular to the rotational axis inside the plane of the sliding surface, on which the pistons of the cylinder drum are supported on the swash plate.
In a particularly advantageous manner, the spring assembly can have a compression spring, which pre-loads the piston rod of the second adjustment cylinder for the movement, which corresponds to the extension of the adjustment piston of the second adjustment cylinder and the retraction of the adjustment piston of the first adjustment cylinder, and thus the pivoting of the pivot lever from the position in which the axes are parallel, toward the position for the maximum pump capacity.
With regard to the actuation of the adjustment device, the assembly can be advantageously made such that the first adjustment cylinder can be subjected to a control pressure for adjusting the pump capacity, and the second adjustment cylinder can be subjected to the prevailing system pressure. As a result, when there is no system pressure, the adjustment device is adjusted to the maximum capacity by the force of the compression spring. When operating the pump with the resulting system pressure, the adjustment remains at the maximum capacity until the adjustment force generated by the control pressure in the first adjustment cylinder exceeds the piston force generated by the system pressure in the 4 second adjustment cylinder, in addition to the spring force, at which point, depending on the control pressure, the swash plate is pivoted back to a lower delivery rate. 2014270792 04 Aug 2017
For operation with a pressure level limited by control pressure, preferably the piston surface of the piston of the first adjustment cylinder, which can be subjected to control pressure, is selected such that it is larger than the piston surface of the piston of the second adjustment cylinder that can be subjected to the system pressure.
According to the present disclosure, there is also provided an axial piston pump of a swash plate construction, comprising: a cylinder drum rotatably driveable about a rotational axis in a pump housing; pump pistons disposed in said cylinder drum and axially displaceable in said cylindrical drum; a swash plate at least indirectly supported by said pump pistons at actuation ends of said pump pistons accessible outside of said cylindrical drum, said swash plate being pivotable to desired angles of inclination relative to said rotational axis; and an adjustment device adjusting the angles of inclination of said swash plate relative to said rotational axis and thereby adjusting lengths of strokes of said pump pistons to vary fluid pressure generated by said pump pistons, said adjustment device including a first adjustment piston and a second adjustment piston hydraulically operable and movable in first and second adjustment cylinders, respectively, said second adjustment cylinder being arranged counter and coaxial to said first adjustment cylinder, said second adjustment piston being movable counter to movement of said first adjustment piston, movement of said first adjustment piston in said first adjustment cylinder being transferable to said swash plate via a driven component having first and second joints, said first joint being a first ball joint located between said first adjustment piston and a first piston rod of said first adjustment cylinder, said second joint being between said first piston rod and an actuating part of said swash plate and being a second ball joint, said second adjustment piston being connected to a second piston rod at an end of said second piston rod by a third ball joint, said first and second piston rods being connected to said actuating part via said second ball joint at ends of said first and second piston rods remote from the respective adjustment pistons, said actuating element being a pivot lever
4A connected to said swash plate, said pivot lever having a free end remote from said pump pistons, said second ball joint having only a single ball head on said free end of said pivot lever and directly facing dome-shaped surfaces on adjacent free ends of said first and second piston rods forming only a single ball socket receiving and directly engaging said ball head. 2014270792 04 Aug 2017
The invention shall be explained in detail below, based on an exemplary embodiment depicted in the drawings. Therein:
Fig, 1 shows a side view of only those components of an exemplary embodiment of the axial piston pump according to the invention that pertain to the adjustment device of the swash plate, wherein the adjustment cylinder of the adjustment device is shown in a cross section;
Fig. 2 shows a longitudinal section of the exemplary embodiment having a cutting plane running through the adjustment device; and
Fig. 3 shows an exploded, extended, perspective, diagonal view of the components of the adjustment device of the exemplary embodiment.
Fig. 1 shows only a part of a pump housing 1 from the exemplary embodiment that shall be described, which is fully visible in Fig. 2. A cylinder drum 3 is mounted in the housing 1, which can rotate about a rotational axis 7 by means of a drive shaft 5, see Fig. 2. In the typical manner of axial piston pumps, the pistons 9, which are axially displaceable in the cylinder drum 3, are supported via sliding shoes 11 located at their upper ends on the sliding surface 13 of a swash plate 15. This is movably guided at its side facing away from the sliding surface 13 via an arc-shaped swash plate bearing 17 on the pump house 1, such that the swash plate 15 can pivot about a pivot axis 19, which lies in a plane of the sliding surface 13 of the swash plate 15 that runs perpendicular to the rotational axis 7. The swash plate 15 can pivot about the pivot axis 19, by means of an adjustment device, indicated as a whole by the numeral 21, between the pivoted setting shown in Fig. 1, which corresponds to the maximum delivery rate of the pump, and the setting in Fig, 2, for zero pump capacity, wherein in this case, the plane of the sliding surface 13 is horizontal, with respect to the
4B WO 2014/187512 PCT/EP2014/000658 vertical course of tile rotational axis 7 in Fig. 2, such that the pistons 9 do not perform a stroke when the cylinder drum 3 rotates.
The adjustment device 21., as the actuating part assigned to the swash plate 15, has a pivot lever 23, which is attached by means of a bolt 25 to the swash plate 15 between two ribs 27 protruding on its lateral surface. The pivot lever 23 extending laterally .form, the cylinder drum 3 has a ball head 29 on its lower, tree end, which is engaged with by control elements of the adjustment devi ce 2 .1, in order to move the pivot lever 23 into the drawing plane, and thus pivot the swash plate 15 about the pivot axis 19.
The adjustment device 21 has a first adjustment cylinder 31, having a cylinder liner 33, in which an adjustment piston 35 is guided. The piston 35 has an inner ball socket 37, which forms a first ball joint together with a ball head 39 on the end of a piston rod 41 allocated thereto. A ball socket 43 is formed on the end of the piston rod 41 opposite the piston 35.
The adjustment device 21 has a second adjustment cylinder 45 with a cylinder liner 47, counter to the first adjustment cylinder 31 and sharing the same cylinder axis. A second piston 49, which has a smaller piston surface for pressurization than the opposing first piston 35, is guided therein. As with the first piston 35, a ball socket 51 is formed in the other piston 49, which forms a further ball joint, together with a ball head 53 on the associated piston rod 55. The end of the piston rod 55 facing away from the ball head 53 has a ball socket 57, as is the case with the piston rod 41 of the first adjustment cylinder 31, which ball socket, together with ball socket 43 of the other piston rod 41 and the ball head 29 on the pivot lever 23, forms a ball joint assigned to the pivot lever 23. A compression spring 61 is clamped between the cylinder liner 47 of the second adjustment cylinder 45 and a spring seat 59 of the piston rod 55, which pre-loads the adjustment device 21 in the setting corresponding to the maximum pump capacity shown in Fig. 1, and also holds the ball heads and ball sockets of the three ball joints that have been formed against one another, without play, in the system.
In order to actuate the adjustment, device 21, the pressure chamber 63 of the first adjustment cylinder 31 can be subjected to a control pressure that determines the pump delivery rate.
The pressure chamber 65 of the second adjustment cylinder 45 is subjected to the system pressure generated during operation of the pump. The force of the compression spring 61, which pre-loads the piston rods 41, 55 for a movement toward the right (corresponding to the 5 WO 2014/187512 PCT/EP2014/000658 depiction in the drawings), retains the adj ustment device in the setting for a maximum delivery rate shown in Fig. I, when the pump is at a standstill, resulting in the second adjustment cylinder 45 not being subjected to any system pressure. In order to adjust the pump to a lower delivery rate during operation, potentially to zero capacity (this setting is shown in Fig. 2), the first adjustment cylinder 31 is supplied with a corresponding control pressure. As soon as the piston force generated by the control pressure in the first adjustment cylinder 31 exceeds the overall force composed of the combined spring force and piston force of the piston 49 of the second adjustment cylinder 35 subjected to the system pressure, the pivot lever 23 is moved toward the left, from the maximum capacity setting shorn in. Fig, 1, to the corresponding control setting. In order to induce this adjustment movement using a control pressure having a relatively low pressure level, the active piston surface on the piston 35 of the first adjustment cylinder 31 is selected such that it is substantially larger than that of the piston 49 of the second adjustment cylinder.
As is particularly apparent in Fig. 2, a hole 67 is formed in the piston 49 that can be subjected to the system pressure. This .forms the entrance of a lubrication channel, which continues via a passage 69 in the piston rod 55, a hole 71 in the ball head 29 of the pivot lever 23 and a passage 73 in the other piston rod 41, up to the ball joint on the piston 35 of the first adjustment cylinder 31. As a result, the pressure fluid that is pressurized by the system pressure, in particul ar in the form of a hydraulic fluid having lubricating characteristics, can make its way as a lubricant to all the bearing surfaces of ail the ball joints, such that the adjustment device 21 functions without wear, with very little friction, and reliably. 6

Claims (18)

  1. THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:-1. An axial piston pump of a swash plate construction, comprising: a cylinder drum rotatably driveable about a rotational axis in a pump housing; pump pistons disposed in said cylinder drum and axially displaceable in said cylindrical drum; a swash plate at least indirectly supported by said pump pistons at actuation ends of said pump pistons accessible outside of said cylindrical drum, said swash plate being pivotable to desired angles of inclination relative to said rotational axis; and an adjustment device adjusting the angles of inclination of said swash plate relative to said rotational axis and thereby adjusting lengths of strokes of said pump pistons to vary fluid pressure generated by said pump pistons, said adjustment device including a first adjustment piston and a second adjustment piston hydraulically operable and movable in first and second adjustment cylinders, respectively, said second adjustment cylinder being arranged counter and coaxial to said first adjustment cylinder, said second adjustment piston being movable counter to movement of said first adjustment piston, movement of said first adjustment piston in said first adjustment cylinder being transferable to said swash plate via a driven component having first and second joints, said first joint being a first ball joint located between said first adjustment piston and a first piston rod of said first adjustment cylinder, said second joint being between said first piston rod and an actuating part of said swash plate and being a second ball joint, said second adjustment piston being connected to a second piston rod at an end of said second piston rod by a third ball joint, said first and second piston rods being connected to said actuating part via said second ball joint at ends of said first and second piston rods remote from the respective adjustment pistons, said actuating element being a pivot lever connected to said swash plate, said pivot lever having a free end, said second ball joint having a ball head on said free end of said pivot lever and facing dome-shaped surfaces on adjacent ends of said first and second piston rods forming a ball socket receiving said ball head.
  2. 2. An axial piston pump according to claim 1 wherein a spring assembly in said adjustment device biases a ball head in a ball socket of said first ball joint.
  3. 3. An axial piston pump according to claim 1 or claim 2 wherein said spring assembly pre-loads said swash plate in a pivoted position relative to said rotational axis according to a maximum pump capacity.
  4. 4. An axial piston pump according to any one of claims 1 to 3 wherein said pivot lever extends parallel to said rotational axis when set to zero pump capacity and extending laterally to said swash plate and said cylinder drum.
  5. 5. An axial piston pump according to claim 1 wherein a spring assembly in said adjustment device biases a ball head in a ball socket of said first ball joint; said spring assembly pre-loads said swash plate in a pivoted position relative to said rotational axis according to a maximum pump capacity; said pivot lever extends parallel to said rotational axis when set to zero pump capacity and extends laterally to said swash plate and said cylinder drum; and said spring assembly comprises a compression spring pre-loading said second piston rod for movement corresponding to an extension of said second adjustment piston and retraction of said first adjustment piston pivoting said pivot lever from a setting for maximum pump capacity.
  6. 6. An axial piston pump according to any one of the preceding claims wherein said first adjustment cylinder is supplied with a control pressure for adjusting pump capacity; and said second adjustment cylinder is supplied with a prevailing system pressure.
  7. 7. An axial piston pump according to claim 6 wherein said first and second adjustment pistons comprise first and second piston surfaces, respectively, subjected to the control pressure and the system pressure, respectively, said first piston surface being larger than said second piston surface.
  8. 8. An axial piston pump according to any one of the preceding claims wherein each of said first and third ball joints comprise a ball socket on the respective adjustment piston and a ball head on the respective piston rod.
  9. 9. An axial piston pump according to any one of the preceding claims wherein said second adjustment piston comprises a continuous lubrication hole therein subjected to system pressure and forming an entrance for a lubrication channel for lubricating said ball joints.
  10. 10. An axial piston pump of a swash plate construction, comprising: a cylinder drum rotatably driveable about a rotational axis in a pump housing; pump pistons disposed in said cylinder drum and axially displaceable in said cylindrical drum; a swash plate at least indirectly supported by said pump pistons at actuation ends of said pump pistons accessible outside of said cylindrical drum, said swash plate being pivotable to desired angles of inclination relative to said rotational axis; and an adjustment device adjusting the angles of inclination of said swash plate relative to said rotational axis and thereby adjusting lengths of strokes of said pump pistons to vary fluid pressure generated by said pump pistons, said adjustment device including a first adjustment piston and a second adjustment piston hydraulically operable and movable in first and second adjustment cylinders, respectively, said second adjustment cylinder being arranged counter and coaxial to said first adjustment cylinder, said second adjustment piston being movable counter to movement of said first adjustment piston, movement of said first adjustment piston in said first adjustment cylinder being transferable to said swash plate via a driven component having first and second joints, said first joint being a first ball joint located between said first adjustment piston and a first piston rod of said first adjustment cylinder, said second joint being between said first piston rod and an actuating part of said swash plate and being a second ball joint, said second adjustment piston being connected to a second piston rod at an end of said second piston rod by a third ball joint, said first and second piston rods being connected to said actuating part via said second ball joint at ends of said first and second piston rods remote from the respective adjustment pistons, said actuating element being a pivot lever connected to said swash plate, said pivot lever having a free end remote from said pump pistons, said second ball joint having only a single ball head on said free end of said pivot lever and directly facing dome-shaped surfaces on adjacent free ends of said first and second piston rods forming only a single ball socket receiving and directly engaging said ball head.
  11. 11. An axial piston pump according to claim 10 wherein a spring assembly in said adjustment device biases a ball head in a ball socket of said first ball joint.
  12. 12. An axial piston pump according to claim 11 wherein said spring assembly pre-loads said swash plate in a pivoted position relative to said rotational axis according to a maximum pump capacity.
  13. 13. An axial piston pump according to any one of claims 10 to 12 wherein said pivot lever extends parallel to said rotational axis when set to zero pump capacity and extending laterally to said swash plate and said cylinder drum.
  14. 14. An axial piston pump according to claim 10 wherein a spring assembly in said adjustment device biases a ball head in a ball socket of said first ball joint; said spring assembly pre-loads said swash plate in a pivoted position relative to said rotational axis according to a maximum pump capacity; said pivot lever extends parallel to said rotational axis when set to zero pump capacity and extend laterally to said swash plate and said cylinder drum; and said spring assembly comprises a compression spring pre-loading said second piston rod for movement corresponding to an extension of said second adjustment piston and retraction of said first adjustment piston pivoting said pivot lever from a setting for maximum pump capacity.
  15. 15. An axial piston pump according to any one of claims 10 to 14 wherein said first adjustment cylinder is supplied with a control pressure for adjusting pump capacity; and said second adjustment cylinder is supplied with a prevailing system pressure.
  16. 16. An axial piston pump according to claim 15 wherein said first and second adjustment pistons comprise first and second piston surfaces, respectively, subjected to the control pressure and the system pressure, respectively, said first piston surface being larger than said second piston surface.
  17. 17. An axial piston pump according to any one of claims 10 to 16 wherein each of said first and third ball joints comprise a ball socket on the respective adjustment piston and a ball head on the respective piston rod.
  18. 18. An axial piston pump according to any one of claims 10 to 17 wherein said second adjustment piston comprises a continuous lubrication hole therein subjected to system pressure and forming an entrance for a lubrication channel for lubricating said ball joints.
AU2014270792A 2013-05-22 2014-03-12 Axial piston pump having a swash-plate type construction Active AU2014270792B2 (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
DE102013008676.0 2013-05-22
DE102013008679.5A DE102013008679A1 (en) 2013-05-22 2013-05-22 axial piston pump
DE102013008681.7 2013-05-22
DE102013008629.9A DE102013008629A1 (en) 2013-05-22 2013-05-22 joint arrangements
DE102013008629.9 2013-05-22
DE102013008677.9A DE102013008677A1 (en) 2013-05-22 2013-05-22 Hydraulic pump and piston for such a hydraulic pump
DE102013008678.7A DE102013008678A1 (en) 2013-05-22 2013-05-22 Process for coating a pump component
DE102013008676.0A DE102013008676A1 (en) 2013-05-22 2013-05-22 axial piston pump
DE102013008681.7A DE102013008681A1 (en) 2013-05-22 2013-05-22 Axial piston pump in swashplate design
DE102013008678.7 2013-05-22
DE102013008679.5 2013-05-22
DE102013008677.9 2013-05-22
PCT/EP2014/000658 WO2014187512A1 (en) 2013-05-22 2014-03-12 Axial piston pump having a swash-plate type construction

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AU2014270792B2 true AU2014270792B2 (en) 2017-08-31

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AU2014270757A Ceased AU2014270757B2 (en) 2013-05-22 2014-04-30 Method for coating a pump component
AU2014270771A Ceased AU2014270771B2 (en) 2013-05-22 2014-05-15 Axial piston pump
AU2014270772A Abandoned AU2014270772A1 (en) 2013-05-22 2014-05-15 Axial piston pump
AU2014270773A Ceased AU2014270773B2 (en) 2013-05-22 2014-05-16 Hydraulic pump and piston for such a hydraulic pump
AU2018204390A Active AU2018204390B2 (en) 2013-05-22 2018-06-19 Axial piston pump

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AU2014270771A Ceased AU2014270771B2 (en) 2013-05-22 2014-05-15 Axial piston pump
AU2014270772A Abandoned AU2014270772A1 (en) 2013-05-22 2014-05-15 Axial piston pump
AU2014270773A Ceased AU2014270773B2 (en) 2013-05-22 2014-05-16 Hydraulic pump and piston for such a hydraulic pump
AU2018204390A Active AU2018204390B2 (en) 2013-05-22 2018-06-19 Axial piston pump

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US (5) US9664184B2 (en)
EP (5) EP2999885B1 (en)
JP (5) JP6426717B2 (en)
CN (5) CN105339657B (en)
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